PSII operates through a series of well-coordinated steps: 1. Photon Absorption: Light energy is absorbed by chlorophyll molecules in the PSII reaction center. 2. Water Oxidation: The absorbed energy is used to oxidize water molecules at the oxygen-evolving complex (OEC), releasing oxygen, protons, and electrons. 3. Electron Transport: The high-energy electrons are transferred through a series of carriers, ultimately reducing plastoquinone to plastoquinol.